Perplexity AI is a generative AI-powered search engine that offers quick, precise responses with in-text citations by fusing online search with extensive language models. A group of AI specialists launched it in December 2022. It offers deep file search through its API, powerful models (GPT-4.1, Claude, and Gemini), and support for both free and Pro users. Task execution across apps is made possible by Perplexity Assistant’s mobile capabilities. With over 100 million searches processed weekly and over 15 million monthly active users, it is a valuable tool for professionals, students, and researchers looking for reliable, source-backed answers.